Hi, > >We're using Acrobat's preflight feature to check for lines > thinner than > >0.2 pts. The thinnest lines in our .eps graphics are exactly 0.2 pts, > >but when we import these graphics in FM and check the PDFs > created from > >FM, Acrobat preflight says the graphics uses "0.199600pt" lines. > > > >PDFs of these individual graphics, created from Illustrator, do not > >have problems with Acrobat prefight, so it seems to be some > sort of FM > >conversion problem. > > > >Why does this happen, and is there any way to prevent this on the FM > >side? If there is no way to fix this, we'd have to tell our > illustrator > >to make the lines in the graphics slightly thicker. > > This looks a lot like a rounding error problem due to two > different applications using different precision math. In > floating-point math, computers use a set number of bits to > represent the complete range of natural numbers. As a result, > some numbers actually cannot be represented precisely: the > more bits you use, the closer you get, but there's always a > compromise.
When I check the font size in my PDF files there?s also often a difference. E.g. the font size in FrameMaker is 10 pt, and Acrobat says 9.96 pt. (Other text in Acrobat has exactly the same font size as in FrameMaker.) 4 % would be a rather large rounding error. I don?t know whether these differences in line width and font size have the same cause. Best regards Winfried
